A flight crew checking the cabin of a Qantas plane before takeoff found rats in a compartment holding medical equipment, grounding the plane for more than a day.
Crews did a visual check of the plane Tuesday afternoon and found no more rats or any damage.
The rodents had been in a cabinet holding a defibrillator. The plane returned to service Thursday morning, officials said.
Passengers had not yet boarded the Sydney-to-Brisbane flight and were instead put on another plane.
A Qantas spokeswoman called the incident "very unusual."
Meanwhile, Thai customs officials found 431 turtles and seven freshwater crocodiles stashed in suitcases offloaded from a passenger flight from Bangladesh.
The animals seized at Bangkok's bustling Suvarnabhumi airport were worth 1 million baht ($33,000), authorities said.
Turtles of varying sizes worth around 2,000 baht apiece in Thai markets, and seven false gavials, a type of freshwater crocodile worth 10,000 baht each, were found on Thursday in small bags packed into cases after authorities received a tipoff that a known trafficker was on his way to Thailand.
The alleged trafficker, a Bangladeshi national, did not collect the luggage and fled on arrival in Bangkok, customs officials said.Story: Baby leopards, bear found in bags at Thailand airport
The discovery was the biggest since September last year, when 1,140 turtles were found by customs on a single day. A further 218 were seized a month later.
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Thailand, which borders four countries, has seen its fair share of illegal wildlife trafficking and customs officials at Suvarnabhumi often seize reptiles and small animals in luggage.
They found a two-month old tiger cub in a bag last August, which was concealed by stuffed tiger toys and bound for Iran.
Prasong Poontaneat, director-general of Thailand's customs department, said it was likely the turtles were destined for Bangkok's Chatujak Market, a sprawling mass of 11,000 stalls and shops that has a dedicated pet section where endangered species are sometimes sold.
The market, which operates on weekends only, generates as much as 1 billion baht ($33 million) a month from some 350,000 foreign and local shoppers, according to the State Railway of Thailand, which owns the land.
Although Thailand has been at the forefront of a regional effort to combat wildlife trafficking, the country's multiple airports, sea ports and road network make it a major transit point for other destinations.
The Associated Press and Reuters contributed to this report.